Someone has asked about having a feature that uses skins exclusively for a player. I'm open to the idea of that, but it would likely be some sort of donator or premium feature. Monetary donations and income aren't a big priority but I can see how at some point it might be useful to buy new equipment, offset costs, or pay for developers to do a project.
We'll see how things turn out. However, for now that is totally not an implemented feature, you can't have an exlcusive skin! I put it in the skins directory, add some metadata to it, and then people can use it. Thats how the current system works. I can't rewrite a new one quickly at this point in time.
Is there a skin from the five hundred :) you've posted that you would like me to add for you (and others) to use in the game? Let me know if you pick one. Think about it before hand because I don't want to change them around every time the direction the wind blows changes :)